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R. Križanec: NOVE INAČICE VREMENSKOG UREĐIVANJA ŠUMA PREBORNOG UZGOJNOG OBLIKA Šumarski list br. 3-4, CXXVII (2003), 109-133 Š uri ć, S. 1933: Prebome sječe u neuređenim prebor-Ugrenović , A. 1985: Pravilnikonačinu izrade šumnim šumama i šumama tipa prašume. Šumarski skogospodarskih osnova područja, osnova goslist 57/5, str. 339-347. Zagreb. podarenja gospodarskim jedinicama i programa Ugrenović,A . 1951: Šuma u svijetlu nauke. JAZU, za gospodarenje šumama. Narodne Novine br. 42/1985. Zagreb. Ugrenović , A. 1990: Zakon o šumama. Narodne Ugrenović,A . 1903: Naredba glede sastavka gosNovine br. 52/1990. podarstvenih osnova i programa... Ugrenović , A. 1994: Zakon o zaštiti prirode. Naro Ugrenović,A . 1937: Uputstva za procenu stabala u dne Novine br. 30/1994. dubećem, str. 1-6, Beograd. Ugrenović , A. 1994: Pravilnik o uređivanju šuma. Ugrenović,A . 1937: uputstva za doznaku stabala i Narodne Novine br. 52/1994. određivanje prihoda u prebornim šumama, str. 17-23. Beograd. Ugrenović , A. 1994: Zakon o zaštiti okoliša. Narodne Novine br. 82/1994. Ugrenović,A . 1951: Uređajni zapisnik "Zalesina", str. 1-20. Opis sastojina g. j . "Zalesina". Ugrenović , A. 1996: Šumskogospodarsko područje Ugrenović,A . 1981: Šumsko gospodarstvo Delnice Hrvatske, Šumskogospodarska osnova (Uređajni zapisnik) 1996-2005. Hrvatske šume, Zagreb. 1960-1980, str. 319. Delnice. Ugrenović , A. 1985: Šumarsko - tehnički priruUgrenović , A. 1997: Pravilnik o uređivanju šuma. Narodne Novine br. 11/1997. čnik. Nakladni zavod Znanje. Zagreb. SUMMARY: In selection forests time is an economic management indicator with no alternative. Although measurable, it has not been adequately evaluated and incorporated in prognostic models of development and future management. The problem of mid- and long-term management planning aimed at achieving multipurpose progressive yield sustainability within the limits of sustainable development of forests that grow "in continuo", that is, permanently, has directed our research of many years to studying time management. This issue forms the key point of the majority of past, as well as this work. By monitoring and recording changes in the growth of a forest in one management unit, new insights into particular features of selection forest development which enable mid- and long-term planning have been established and presented in this paper. The processes and the length of development of wood mass of individual trees are long-lasting and limited in time by physiological maturity. The processes and duration of the development of the growing stock making up the wood mass of these trees are permanent and take place "in continuo ", in closed integral circles or cycles. In a normal selection forest one integral cycle in the development of growing stock takes up three average transition times (3Ts) for a stand as a unit. In terms of duration it equals a management cycle, in which the amount of annual yield equals the increment of a normal growing stock (V) but in such a way that the other growing stock of the same size remains on the stump as a new increment reproducer in the new cycle. Three consecutive management cycles in a series form a development period or management conversion period. In the course of period duration in time (3x3Ts=9Ts) wood mass amounting to three normal growing stocks (3 V) are obtained in the three cycles, while the fourth remains on the stump in the forest. The equilibrium of natural diversity of forest bio- and ecosystem is realised through a continuous coordination of triple relationship: growing stock- increment -yield. Based on new insights into a continuous sequence of cycles and the possibility of direct measurement of the time needed to fully utilise normal growing stocks of a selection forest, a new formula for determining a normal annual |